OpportunisticContainersQueuePolicy.java
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.yarn.server.nodemanager.containermanager.scheduler;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
/**
* Determines how to schedule opportunistic containers at the NodeManager,
* i.e., whether or not to accept, queue, or reject a container run request.
*/
public enum OpportunisticContainersQueuePolicy {
/**
* Determines whether or not to run a container by the queue capacity:
* {@link YarnConfiguration#NM_OPPORTUNISTIC_CONTAINERS_MAX_QUEUE_LENGTH}.
* If there's enough capacity in the queue,
* queues the container, otherwise rejects it.
*/
BY_QUEUE_LEN,
/**
* Determines whether or not to run a container based on the amount of
* resource capacity the node has.
* Sums up the resources running + already queued at the node, compares
* it with the total capacity of the node, and accepts the new container only
* if the computed resources above + resources used by the container
* is less than or equal to the node capacity.
*/
BY_RESOURCES;
public static final OpportunisticContainersQueuePolicy DEFAULT = BY_QUEUE_LEN;
}